P89CV51RD2FBC,557 NXP Semiconductors, P89CV51RD2FBC,557 Datasheet - Page 34

• Manufacturer Part Number: P89CV51RD2FBC,557
• Description: IC 80C51 MCU FLASH 64K 44-TQFP
• Manufacturer: NXP Semiconductors
• Series: 89Cr

Specifications of P89CV51RD2FBC,557

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: EBI/EMI, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Processor Series: P89CV5x
• Core: 80C51
• Data Bus Width: 8 bit
• Data Ram Size: 1 KB
• Interface Type: SPI, UART
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: - 40 C
• Cpu Family: 89C
• Device Core: 80C51
• Device Core Size: 8b
• Frequency (max): 40MHz
• Total Internal Ram Size: 1KB
• # I/os (max): 32
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Package Type: TQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details
• Other names: 568-4257; 935284103557; P89CV51RD2FBC

NXP Semiconductors
P89CV51RB2_RC2_RD2_3
Product data sheet
6.5.3 Programmable clock-out
6.5.4 Baud rate generator mode
A 50 % duty cycle clock can be programmed to come out on pin T2 (P1[0], Clock-out
mode). This pin, besides being a regular I/O pin, has two additional functions. It can be
programmed:
To configure the timer/counter 2 as a clock generator, bit C/T2 (in T2CON) must be
cleared and bit T2OE in T2MOD must be set. Bit TR2 (T2CON.2) also must be set to start
the timer.
The clock-out frequency depends on the oscillator frequency and the reload value of
Timer 2 capture registers (RCAP2H, RCAP2L) as shown in
Where (RCAP2H, RCAP2L) = the content of RCAP2H and RCAP2L taken as a 16-bit
unsigned integer.
In the Clock-out mode, Timer 2 roll-overs will not generate an interrupt. This is similar to
when it is used as a baud rate generator.
Bits TCLK and/or RCLK in T2CON allow the UART transmit and receive baud rates to be
derived from either Timer 1 or Timer 2; see
1 is used as the UART transmit baud rate generator. When TCLK = 1, Timer 2 is used as
the UART transmit baud rate generator. RCLK has the same effect for the UART receive
baud rate. With these two bits, the serial port can have different receive and transmit baud
rates, Timer 1 or Timer 2.
Figure 14
------------------------------------------------------------------------------------------
2
1. To input the external clock for timer/counter 2, or
2. To output a 50 % duty cycle clock ranging from 122 Hz to 8 MHz at a 16 MHz
Fig 14. Timer 2 in Baud rate generator mode
operating frequency.
65536
T2 pin
OSC
OscillatorFrequency
shows Timer 2 in Baud rate generator mode:
–
T2EX pin
RCAP2H RCAP2L
2
transition
detector
Rev. 03 — 25 August 2009
C/T2 = 0
C/T2 = 1
EXEN2
control
TR2
P89CV51RB2/RC2/RD2
control
Section 6.6
EXF2
RCAP2L RCAP2H
(8-bits)
timer 2
interrupt
TL2
for details. When TCLK = 0, Timer
(8-bits)
Equation
TH2
80C51 with 1 kB RAM, SPI
reload
2:
© NXP B.V. 2009. All rights reserved.
TX/RX baud rate
002aaa526
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